/*
 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package javax.swing.plaf.synth;

import java.awt.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.*;
import javax.swing.plaf.basic.BasicHTML;
import javax.swing.plaf.basic.BasicToolTipUI;
import javax.swing.plaf.ComponentUI;
import javax.swing.text.View;


/**
 * Provides the Synth L&amp;F UI delegate for
 * {@link javax.swing.JToolTip}.
 *
 * @author Joshua Outwater
 * @since 1.7
 */
public class SynthToolTipUI extends BasicToolTipUI
    implements PropertyChangeListener, SynthUI {

  private SynthStyle style;

  /**
   * Creates a new UI object for the given component.
   *
   * @param c component to create UI object for
   * @return the UI object
   */
  public static ComponentUI createUI(JComponent c) {
    return new SynthToolTipUI();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void installDefaults(JComponent c) {
    updateStyle(c);
  }

  private void updateStyle(JComponent c) {
    SynthContext context = getContext(c, ENABLED);
    style = SynthLookAndFeel.updateStyle(context, this);
    context.dispose();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void uninstallDefaults(JComponent c) {
    SynthContext context = getContext(c, ENABLED);
    style.uninstallDefaults(context);
    context.dispose();
    style = null;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void installListeners(JComponent c) {
    c.addPropertyChangeListener(this);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void uninstallListeners(JComponent c) {
    c.removePropertyChangeListener(this);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public SynthContext getContext(JComponent c) {
    return getContext(c, getComponentState(c));
  }

  private SynthContext getContext(JComponent c, int state) {
    return SynthContext.getContext(c, style, state);
  }

  private int getComponentState(JComponent c) {
    JComponent comp = ((JToolTip) c).getComponent();

    if (comp != null && !comp.isEnabled()) {
      return DISABLED;
    }
    return SynthLookAndFeel.getComponentState(c);
  }

  /**
   * Notifies this UI delegate to repaint the specified component.
   * This method paints the component background, then calls
   * the {@link #paint(SynthContext, Graphics)} method.
   *
   * <p>In general, this method does not need to be overridden by subclasses.
   * All Look and Feel rendering code should reside in the {@code paint} method.
   *
   * @param g the {@code Graphics} object used for painting
   * @param c the component being painted
   * @see #paint(SynthContext, Graphics)
   */
  @Override
  public void update(Graphics g, JComponent c) {
    SynthContext context = getContext(c);

    SynthLookAndFeel.update(context, g);
    context.getPainter().paintToolTipBackground(context,
        g, 0, 0, c.getWidth(), c.getHeight());
    paint(context, g);
    context.dispose();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void paintBorder(SynthContext context, Graphics g, int x,
      int y, int w, int h) {
    context.getPainter().paintToolTipBorder(context, g, x, y, w, h);
  }

  /**
   * Paints the specified component according to the Look and Feel.
   * <p>This method is not used by Synth Look and Feel.
   * Painting is handled by the {@link #paint(SynthContext, Graphics)} method.
   *
   * @param g the {@code Graphics} object used for painting
   * @param c the component being painted
   * @see #paint(SynthContext, Graphics)
   */
  @Override
  public void paint(Graphics g, JComponent c) {
    SynthContext context = getContext(c);

    paint(context, g);
    context.dispose();
  }

  /**
   * Paints the specified component.
   *
   * @param context context for the component being painted
   * @param g the {@code Graphics} object used for painting
   * @see #update(Graphics, JComponent)
   */
  protected void paint(SynthContext context, Graphics g) {
    JToolTip tip = (JToolTip) context.getComponent();

    Insets insets = tip.getInsets();
    View v = (View) tip.getClientProperty(BasicHTML.propertyKey);
    if (v != null) {
      Rectangle paintTextR = new Rectangle(insets.left, insets.top,
          tip.getWidth() - (insets.left + insets.right),
          tip.getHeight() - (insets.top + insets.bottom));
      v.paint(g, paintTextR);
    } else {
      g.setColor(context.getStyle().getColor(context,
          ColorType.TEXT_FOREGROUND));
      g.setFont(style.getFont(context));
      context.getStyle().getGraphicsUtils(context).paintText(
          context, g, tip.getTipText(), insets.left, insets.top, -1);
    }
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public Dimension getPreferredSize(JComponent c) {
    SynthContext context = getContext(c);
    Insets insets = c.getInsets();
    Dimension prefSize = new Dimension(insets.left + insets.right,
        insets.top + insets.bottom);
    String text = ((JToolTip) c).getTipText();

    if (text != null) {
      View v = (c != null) ? (View) c.getClientProperty("html") : null;
      if (v != null) {
        prefSize.width += (int) v.getPreferredSpan(View.X_AXIS);
        prefSize.height += (int) v.getPreferredSpan(View.Y_AXIS);
      } else {
        Font font = context.getStyle().getFont(context);
        FontMetrics fm = c.getFontMetrics(font);
        prefSize.width += context.getStyle().getGraphicsUtils(context).
            computeStringWidth(context, font, fm, text);
        prefSize.height += fm.getHeight();
      }
    }
    context.dispose();
    return prefSize;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void propertyChange(PropertyChangeEvent e) {
    if (SynthLookAndFeel.shouldUpdateStyle(e)) {
      updateStyle((JToolTip) e.getSource());
    }
    String name = e.getPropertyName();
    if (name.equals("tiptext") || "font".equals(name) ||
        "foreground".equals(name)) {
      // remove the old html view client property if one
      // existed, and install a new one if the text installed
      // into the JLabel is html source.
      JToolTip tip = ((JToolTip) e.getSource());
      String text = tip.getTipText();
      BasicHTML.updateRenderer(tip, text);
    }
  }
}
